Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Sum multiple renovation project line-item costs plus a contingency buffer into a total budget estimate.
Enter your project category costs to calculate a total renovation budget.
A whole-home renovation is really several separate projects bundled together, each priced independently using this site's more specific calculators (concrete, roofing, flooring, paint, and more). This calculator's job is simpler: sum your own line-item cost estimates for each category and add a contingency buffer, a standard budgeting practice for the unexpected costs that surface once work actually begins.
Enter your own estimated cost for each renovation category (kitchen, bathroom, flooring, painting, roofing, and a catch-all "other" for anything not listed), plus a contingency percentage (15% is a commonly cited starting point for renovation budgets, though older homes or projects with unknown structural conditions often warrant 20% or more).
Subtotal = Sum of All Category Costs
Contingency = Subtotal × Contingency %
Total Budget = Subtotal + Contingency
Renovation projects, especially in older homes, frequently uncover unexpected issues once walls or floors are opened up (electrical, plumbing, or structural problems) -- a contingency buffer is standard practice specifically to absorb those surprises without blowing the entire budget.
Because this tool only adds up figures you supply, the quality of the total depends entirely on the quality of each line. Start with the biggest categories and get at least two contractor quotes for those, since large jobs are where a small percentage difference turns into real money. For materials you plan to buy yourself, calculate quantities first and price them using current store or supplier prices, then add a separate allowance for labor if you are hiring someone.
Write each estimate as an all-in figure: materials, labor, disposal of old materials, delivery, and any permit costs. A frequent budgeting mistake is entering a material-only number for one category and an installed price for another, which makes the total look smaller than it will be.
The catch-all field is best used for items that are easy to forget. Examples include permits and inspection fees, dumpster rental, temporary housing or extra meals out during a kitchen remodel, painting touch-ups after other trades finish, electrical or plumbing changes that come with moving walls, and design or engineering fees. If you are unsure, it is better to list them than to leave them to the contingency.
Hypothetical example: kitchen $18,000, bathroom $9,000, flooring $6,500, painting $3,000, roofing $0, other $2,500 for permits and a dumpster. Subtotal is $39,000. At a 20 percent contingency, the buffer is $7,800 and the total budget is $46,800. If nothing unexpected happens, the leftover buffer is a bonus rather than a shortfall.
The contingency should reflect how much you do not know. If you have already opened the walls and seen the wiring and plumbing, you can go lower. If the house is older, the project touches structure, or you are unsure what is behind tile or plaster, go higher. A contingency is not the same as a wish list upgrade fund, so decide in advance whether you would spend it on upgrades if it goes unused. Also treat it as a single pool for the whole project rather than per line, since problems usually hit one area at a time.
The result is a planning budget, not a quote. Use it to compare against your savings or loan amount, to decide which projects to phase, and to see how much cushion you carry. Confirm permit requirements with your local building department, and rely on written contractor estimates before committing to spend.
15% is a commonly cited baseline, but older homes, projects involving structural changes, or anything with unknown conditions behind walls/floors often warrant 20-25% instead.
Use this site's material-specific calculators (concrete, flooring, roofing, paint, and more) for each category, or get contractor quotes -- this tool only sums the totals you provide, it doesn't estimate individual category costs itself.
Yes, either within the category they belong to or in the other field. Fees and rules vary by location, so confirm with your local building department.
Yes. The tool applies a single percentage to the combined subtotal, which is how many people budget a reserve.
Run the calculator once per phase, and remember that material and labor prices may change between phases.
No. It sums only the project costs and the contingency you enter.